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+Flex carries the copyright used for BSD software, slightly modified
+because it originated at the Lawrence Berkeley (not Livermore!) Laboratory,
+which operates under a contract with the Department of Energy:
+
+       Copyright (c) 1989 The Regents of the University of California.
+       All rights reserved.
+
+       This code is derived from software contributed to Berkeley by
+       Vern Paxson.
+
+       The United States Government has rights in this work pursuant to
+       contract no. DE-AC03-76SF00098 between the United States Department of
+       Energy and the University of California.
+
+       Redistribution and use in source and binary forms are permitted
+       provided that the above copyright notice and this paragraph are
+       duplicated in all such forms and that any documentation,
+       advertising materials, and other materials related to such
+       distribution and use acknowledge that the software was developed
+       by the University of California, Berkeley.  The name of the
+       University may not be used to endorse or promote products derived
+       from this software without specific prior written permission.
+       THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+       IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+       WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+
+This basically says "do whatever you please with this software except
+remove this notice".
+
+Note that the "flex.skel" scanner skeleton carries no copyright notice.
+You are free to do whatever you please with scanners generated using flex;
+for them, you are not even bound by the above copyright.